依据甜菜夜蛾年发生代数较少,主要依靠幼虫的突发性暴食引发灾害,防治时应选能杀灭当代幼虫的高效农药,盛期用抑太保、米满;盛末期用乐斯本、凯撒、灭多威等农药;小菜蛾年发生代数较多,主要依靠幼虫数量的突发性高涨引发灾害,防治时应选能抑制幼虫的数量增长的持效农药,初期用阿维菌素、BT;盛期用乐斯本等农药。 Based on beet armyworm annual occurrence of algebra less, mainly rely on sudden burst of larvae lead to disasters, prevention and treatment should be selected to kill contemporary larvae of high efficiency pesticides, Caesar, methomyl and other pesticides; Plutella xylostella more occurrence of algebra, mainly rely on the sudden rise in the number of larvae caused by disasters, prevention and treatment should be selected to inhibit the growth of the number of larvae of pesticides, the initial use of avermectin, BT; peak period with such pesticides.